Complexity: Possibly the simplest deck in the format with concise text, vanilla monsters, and no combos at all
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There are a handful of effects that directly benefit you for playing Spirits, such as Battleground Geist, which gives all of your spirits +1/+0 , or Spectral Shepherd, which allows you to bounce a Spirit back to your hand to avoid death or get a second use out of its enter effect
It's around #14 or 15 on my list and not in the Top 10 proper, but the ability to force someone to discard, and destroy artifacts and critters with one number is a very precise scalpel that destroys what you need, but tends to leave your own stuff alone
However, now that I have taken the time to study them a little bit more, I have to say that they are a fun archetype that is quite unique amongst the various archetypes in the game